256 proceedings: biological society 



bowlders up to 5 by 10 by 20 feet, which are now found 8 miles or 

 more from the nearest granite outcrop. They were probably trans- 

 ported by sapping and water. The type Wind River is like the "Wa- 

 satch" at Whiskey Peak, which can be traced southward to the U. 

 P. Railway, and is of the same age as the beds above the angular un- 

 conformity in the Hanna Basin. It is like the Wasatch of Bighorn 

 Basin and the Coryphodon bearing beds of Powder River Basin, 

 which include the Kingsbury conglomerate resting on upturned for- 

 mations including Madison limestone and the Great Pine Ridge beds. 

 The unconformity below the Kingsbury is of more than local impor- 

 tance and corresponds to the pronounced angular unconformity in the 

 other basins. The formations above this unconformity in each basin 

 except the Hanna Basin contain a Coryphodon fauna that varies 

 somewhat from basin to basin, more because of incompleteness of 

 collections than of difference in age. 



Two alternatives appear to be possible; first, the terms Fort Union, 

 Wind River, and Wasatch may apply to the same group of strata or, 

 second, the type Fort Union of North Dakota may include at the top 

 beds of Wind River age and should therefore be separable into Fort 

 Union below and Wind River above. The first alternative appears 

 the more probable. 



The Wind River is unconformably overlain by the White River 

 formation, which is highly arkosic, volcanic, clayey, and conglomeratic, 

 and contains pebbles of lava and andesitic porphyry, the latter derived 

 from the intrusives in the Rattlesnake Mountains. The porphyry 

 pebbles are not found in the Wind River, and hence are post-Wind 

 River and pre-White River in age. The North Park formation of Hanna 

 Basin and possibly the Browns Park formation of Colorado, which are 

 of like composition and position, are of the same age. 



Carroll H. Wegemann, Secretary. 



THE BIOLOGICAL SOCIETY OF WASHINGTON 



The 552d regular meeting of the Biological Society of Washington 

 was held in the Assembly Hall of the Cosmos Club, Saturday, March 11, 

 1916, at 8:00 p.m.; called to order by President Hay, with 28 persons 

 present. 



On recommendation of the Council the following persons were elected 

 to active membership: Dr. Molyneux L. Turner, R. T. Jackson, 

 H. L. Viereck. 



Under the heading Brief Notes and Exhibition of Specimens, Dr. 

 Shufeldt exhibited lantern slide views of some of the aquatic and ter- 

 restial vertebrates of the District of Columbia and vicinity. 



Under the same heading Mr. Wm. Palmer made remarks on, and 

 exhibited, the bones of a hitherto unknown cetacean lately collected 

 by him at Chesapeake Beach, Maryland. 



The first paper of the regular program was by M. W. Lyon, Jr.: 

 Hemolysis and complement fixation. Dr. Lyon outlined the steps in 



